import time

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.select import Select

driver=webdriver.chrome()
driver.get('https://www.qunar.com/')
driver.maximize_window()
time.sleep(2)
driver.find_element(By.ID,'kw').send_keys('去哪儿')
driver.find_element(By.ID,'su').click()
time.sleep(2)

driver.find_element(By.XPATH,'//*[@id="1"]/div/div[1]/h3/a').click()
time.sleep(2)

el=driver.find_element(By.CLASS_NAME,'qcbox-info')
se=Select(el)
se.select_by_value('js-hotcitylist')